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The tubular ceramic membranes of clay minerals were modified with pyrocarbon, which was obtained by carbonizing of polymer precursors at 750 ° С in an argon flow. The precursor to carbonization of membrane II was polyurethane, obtained from laprol and polyisocyanate. A precursor to carbonization of the membrane III was a mixture of polymers formed by the reaction of components of an aqueous solution of a dry solution with NCO-groups of polyisocyanate. As a result of the modification, the membranes became black with a metallic luster. The composition and structure of the membranes were studied by XRF and SEM. The modifier of the membrane II is located in the pore space in the form of sintered agglomerates. The modifier of the membrane III is represented not only by the same agglomerates, but also envelops the structural elements of the membrane material. The apparent density and open porosity for the unmodified membrane are 1.80 g/cm3 and 44.9 %, for membrane II - 1.67 g/cm3 and 39.9 %, for membrane III - 1.68 g/cm3 and 38.3 %. Testing of modified membranes was carried out by water purification from Ca2 + and Fe3 + using the baromembrane method. The concentration of Ca2 + and Fe3 + in aqueous solutions of CaCl2 and FeCl3 was 100 mg/dm3. The period of time until the establishment of dynamic equilibrium in systems during water purification is (1–3 h). After reaching equilibrium the retention factor (R) of Ca2 + during water purification with membrane II is 30% at a pressure of 0.6 MPa, and at a pressure of 1.1 MPa – 18 %. The specific productivity increases with increasing pressure from 10 to 18 dm3/(m2×h). The R of Ca2 + in water purification with membrane III is 22 % at a pressure of 0.4 MPa, and the specific productivity is 47 dm3/(m2×h). The unmodified membrane does not inhibit Ca2 + at all, and its specific productivity at a working pressure of 0.7 MPa decreases from 755 to 500 dm3/(m2×h) in 2-3 hours. The coefficient of retention of Fe3 + by membrane III after 5 hours at a working pressure of 0.4 MPa is 98 % The specific productivity in this case is 8 dm3/(m2×h).

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The tubular ceramic membranes of clay minerals were modified with silica and pyrocarbon, which was obtained by carbonizing of polymer precursors at 750 ° С in an argon flow. The precursors to carbonation were polymers formed from the polyisocyanate and sodium carboxymethylcellulose (membrane II) and polyisocyanate and sucrose (membrane III). Silicon dioxide was formed at high temperature from liquid glass. As a result of the modification, the membranes became black with a metallic luster. The composition and structure of the membranes were studied by XRF and SEM. The modifier of the membranes is located in the pore space in the form of separate particles and sintered agglomerates. The particle size of the modified membrane filler varies from 30 nm to ~ 1 μm depending on the modifier composition. The apparent density and open porosity for the unmodified membrane are 1.80 g/cm3 and 21.9 %, for membrane II - 1.83 g/cm3 and 19.7 %, for membrane III - 1.82 g/cm3 and 18.9 %. Testing of modified membranes was carried out by water purification from Ca2+ and Fe3+ using the baromembrane method at a working pressure of 0.6 MPa. The concentration of Ca2+ in aqueous solutions of CaCl2 was 100 mg/dm3, the concentration of Fe3+ in aqueous solutions of FeCl3 was 100 and 36 mg/dm3. The period of time until the establishment of dynamic equilibrium in systems during water purification is 4 hours. The unmodified membranes does not inhibit Ca2+ and Fe3+ at all. After reaching equilibrium the retention factor (R) of Ca2+ during water purification with modified membranes pressure vary from 20 to 28 % and the specific productivity – from 22 to 40 dm3/(m2×h). The retention coefficient of Fe3+, depending on the membranes modifier and concentration of the FeCl3 solutions being purified,  is 78 - 99.9 %. The specific productivity in this case is 15 - 52.3 dm3/(m2×h).